Am I the only one normal in this family?

Darkness. Deep like the ocean, broken only by some white lights that flashed cowardly into the black. That's what you can find in the room where a person dressed in black is grinning, looking at a desk. Its smile is creepy, and, because of the mask, you can't understand only by looking if it's a boy or a girl. The only thing you can get from the appearance is that it's young, because its skin is still extremely clear and healthy, even though, seen through some evil-looking lights like the lone thing that illuminate, flashing, the small room, that skin might look pale like the one of a dead. On the desk, there was a photo of a family. There were the parents, a man with brightly silver hair and a huge smile on his mouth and a woman with short, brown hair, who was keeping in her hands two babies, a boy, probably around a year, with short blue hair, and a girl, who seemed to have just born, and had big magenta eyes and only a few pink hair. At their feet, there was a good-looking eleven years old girl, with long, purple hair kept back with a ponytail and eyes of the same colour, holding her hand with a boy who seemed a bit younger, who had carrot-like hair which covered his eyes and a shy smile to the camera, and, on the other side of the girl, there was a blond-haired boy with amber eyes and an arrogant gaze, who seemed ten years old. The person was looking at the family with a lost gaze. Then, it looked at its diary and took a pen. It was sure that soon, there would happen something truly funny. Its plan was gonna come in action.